You don't really give enough load information, but here are some other considerations you need to consider.
Elevation: Many generators start derating at 500 feet above sea level.
Fuel Type: Fuels like propane affect the output of generators.
Ambient air temperature and installation location air flow.
Expected usage and life expecations of the generator.
Load diversity and peak step KVA.
User mentatility.
Until this is all thrown into the equation you are just hoping to be lucky. For my own power outage use, knowing limitations would help me as a user limit my loading.
I would talk to a reputable generator (distributor) dealer of one of the well known brands and then go with what they recommend. If they are not aware of the above considerations you may be better served by looking elsewhere.
To use their information to size a cheaper brand will leave you wishing you had listened. For example, a Honda motor on a generator is not a Honda generator, carboration, or muffler and can be a huge dissapiontment.
Shane
